Errors create nsmanagedobject subclass

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I found one of the posts that explain this:

'Dog' is ambiguous for type lookup in this context

Hey all! Thanks for letting us know about this problem and for helping others out. We’ve updated Chapters 2 and 3 of the book to help avoid this issue under Xcode 8.1: https://www.raywenderlich.com/148554/core-data-tutorials-updated All Core Data by Tutorials PDF customers get this as a free update!

This should help.